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<p><img src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/image-20210315204249084.png" alt="image-20210315204249084"></p>
<h1 id="Session共享问题-1"><a href="#Session共享问题-1" class="headerlink" title="Session共享问题"></a>Session共享问题</h1><p>分布式下session共享问题</p>
<ul>
<li>不同域名不能共享</li>
<li>同一个服务,复制多份,session不同步问题</li>
<li>不同服务,session不能共享</li>
</ul>
<h1 id="Session共享解决"><a href="#Session共享解决" class="headerlink" title="Session共享解决"></a>Session共享解决</h1><h2 id="session复制"><a href="#session复制" class="headerlink" title="session复制"></a>session复制</h2><p><img src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/image-20210315204918578.png" alt="image-20210315204918578"></p>
<p>优点:</p>
<ul>
<li>web-server(Tomcat)原生支持,只需要修改配置文件</li>
</ul>
<p>缺点</p>
<ul>
<li>session同步需要数据传输,占用大量网络带宽,降低服务器群的业务处理能力</li>
<li>任意一台web-server保存的数据都是所有web-server的session总和,受到内存限制无法水平拓展更多server</li>
<li>大型分布式集群情况下,由于所有的web-server都全量保存数据,所以不可取</li>
</ul>
<h2 id="客户端存储"><a href="#客户端存储" class="headerlink" title="客户端存储"></a>客户端存储</h2><p><img src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/image-20210315205223753.png" alt="image-20210315205223753"></p>
<p>优点</p>
<ul>
<li>服务器不需要存储sessio,用户保存自己的session信息到cookie中.节省服务端资源</li>
</ul>
<p>缺点</p>
<ul>
<li>都是缺点,基本不可能使用</li>
<li>每次http请求,携带用户cookie中的完整信息,浪费网络带宽</li>
<li>session数据放在cookie中,cookie有长度限制4k,不能保存大量信息</li>
<li>session数据放在cookie中,存在泄漏,篡改,窃取等安全问题</li>
</ul>
<h3 id="hash一致性"><a href="#hash一致性" class="headerlink" title="hash一致性"></a>hash一致性</h3><p><img src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/image-20210315205635833.png" alt="image-20210315205635833"></p>
<p>优点</p>
<ul>
<li>只需要改nginx配置,不需要修改应用代码</li>
<li>负载均衡,只要hash属性的值分布是均匀的,多台web-server的负载是均衡的</li>
<li>可以支持web-server水平拓展(session同步法是不行的,受内存限制)</li>
</ul>
<p>缺点</p>
<ul>
<li>session还是存在web-server中的,所以web-server重启可能导致session丢失, 影响业务</li>
<li>如果web-server水平拓展,rehash后session重新分布,也会有一部分用户路由不到正确的session</li>
</ul>
<p>但是以上两种缺点问题也不是很大,因为session本来都是有效期的,所以这两种反向代理的方式可以使用</p>
<h3 id="统一存储"><a href="#统一存储" class="headerlink" title="统一存储"></a>统一存储</h3><p><img src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/image-20210315205926564.png" alt="image-20210315205926564"></p>
<p>优点:</p>
<ul>
<li>没有安全隐患</li>
<li>可以水平拓展,数据库/缓存水平切分即可</li>
<li>web-server重启或者扩容都不会有session丢失</li>
</ul>
<p>不足</p>
<ul>
<li>增加了一次网络调用,并且需要修改应用代码</li>
<li>如将所有的getSession方法替换为从Redis查数据</li>
<li>上面缺点 SpringSession可以完美解决</li>
</ul>
<p>引入依赖</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line">&lt;!-- https://mvnrepository.com/artifact/org.springframework.session/spring-session-data-redis --&gt;</span><br><span class="line">&lt;dependency&gt;</span><br><span class="line">    &lt;groupId&gt;org.springframework.session&lt;/groupId&gt;</span><br><span class="line">    &lt;artifactId&gt;spring-session-data-redis&lt;/artifactId&gt;</span><br><span class="line">    &lt;version&gt;2.3.0.RELEASE&lt;/version&gt;</span><br><span class="line">&lt;/dependency&gt;</span><br></pre></td></tr></table></figure>



<p>在配置文件</p>
<figure class="highlight yml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br></pre></td><td class="code"><pre><span class="line"><span class="attr">session:</span></span><br><span class="line">	<span class="attr">store-type:</span> <span class="string">redis</span></span><br><span class="line">	</span><br><span class="line"><span class="attr">server:</span> </span><br><span class="line">	<span class="attr">port:</span> <span class="number">8200</span></span><br><span class="line">	<span class="attr">servlet:</span></span><br><span class="line">		<span class="attr">session:</span></span><br><span class="line">			<span class="attr">timeout:</span> <span class="string">30m</span></span><br></pre></td></tr></table></figure>

<p>主类上标注</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@EnableRedisHttpSession</span> <span class="comment">//整合redis作为session存储</span></span><br></pre></td></tr></table></figure>



<p><img src= "" data-lazy-src="images/%E5%88%86%E5%B8%83%E5%BC%8Fsession/image-20200825003920688.png" alt="image-20200825003920688"></p>
<p>解决子域作用共享问题</p>
<figure class="highlight plaintext"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br></pre></td><td class="code"><pre><span class="line">@Configuration</span><br><span class="line">public class YtmallSessionConfig &#123;</span><br><span class="line"></span><br><span class="line">    @Bean</span><br><span class="line">    public CookieSerializer cookieSerializer() &#123;</span><br><span class="line">        DefaultCookieSerializer serializer = new DefaultCookieSerializer();</span><br><span class="line">        serializer.setCookieName(&quot;YTSESSION&quot;);</span><br><span class="line">        serializer.setDomainName(&quot;.ytmall.com&quot;);</span><br><span class="line">        return serializer;</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">//自定义序列化</span><br><span class="line">    @Bean</span><br><span class="line">    public RedisSerializer&lt;Object&gt; springSessionDefaultRedisSerializer() &#123;</span><br><span class="line">        return new GenericFastJsonRedisSerializer();</span><br><span class="line">    &#125;</span><br></pre></td></tr></table></figure>

<h3 id="核心原理"><a href="#核心原理" class="headerlink" title="核心原理"></a>核心原理</h3><p>@EnableRedisHttpSession导入RedisHttpSessionConfiguration</p>
<ol>
<li><p>给容器中添加了一个组件</p>
<p>sessionRepository (可以自定义实现)&gt;&gt;</p>
<p>RedisOperationSessionRepository: redis操作session. session的增删改查封装类</p>
</li>
<li><p>SessionRepositoryFilter: session存储过滤器 每一个请求过来都必须经过filter</p>
<ol>
<li><p>创建的时候,就从容器中获取到了SessionRepository</p>
</li>
<li><p>SessionRepositoryFilter: 把原生的请求做了包装, 包装原始请求对象</p>
</li>
<li><p>放行 放的是包装后的request和response 包装后的对象应用到了我们后面的整个执行链</p>
<p>以后获取session,都调用request.getSession()</p>
<p>wrappedRequest.getSession() 全是在sessionrepository中获取到的</p>
<p>(<strong>装饰者模式</strong>)</p>
</li>
</ol>
</li>
</ol>
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title="接口幂等性问题"><img class="cover" src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/img/分布式.jpg" alt="cover"><div class="content is-center"><div class="date"><i class="far fa-calendar-alt fa-fw"></i> 2020-09-13</div><div class="title">接口幂等性问题</div></div></a></div><div><a href="/posts/cdcc4eae/" title="分布式事务"><img class="cover" src= "" data-lazy-src="https://gitee.com/xyingtao/blogimage/raw/master/img/分布式.jpg" alt="cover"><div class="content is-center"><div class="date"><i class="far fa-calendar-alt fa-fw"></i> 2020-09-08</div><div class="title">分布式事务</div></div></a></div></div></div><hr/><div id="post-comment"><div class="comment-head"><div class="comment-headline"><i class="fas fa-comments fa-fw"></i><span> 评论</span></div></div><div class="comment-wrap"><div><div id="twikoo-wrap"></div></div></div></div></div><div class="aside-content" id="aside-content"><div class="card-widget card-info"><div class="is-center"><div class="avatar-img"><img src= "" data-lazy-src="https://s2.loli.net/2022/08/20/hk9Zvq4YRsIcnrw.jpg" onerror="this.onerror=null;this.src='/img/friend_404.gif'" alt="avatar"/></div><div class="author-info__name">樱桃先生</div><div class="author-info__description">樱桃先生的博客小站</div></div><div class="card-info-data site-data is-center"><a href="/archives/"><div class="headline">文章</div><div class="length-num">78</div></a><a href="/tags/"><div class="headline">标签</div><div class="length-num">65</div></a><a href="/categories/"><div class="headline">分类</div><div class="length-num">21</div></a></div><a id="card-info-btn" target="_blank" rel="noopener" href="https://ytblogpic.oss-cn-guangzhou.aliyuncs.com/typoraWechat.jpeg"><i class="fab fa-weixin"></i><span>加为好友</span></a></div><div class="card-widget card-announcement"><div class="item-headline"><i class="fas fa-bullhorn fa-shake"></i><span>公告</span></div><div class="announcement_content">欢迎光临樱桃小窝🍒～评论系统日常崩溃，没有找到长期稳定好用的组件。</div></div><div class="sticky_layout"><div class="card-widget" id="card-toc"><div class="item-headline"><i class="fas fa-stream"></i><span>目录</span><span class="toc-percentage"></span></div><div class="toc-content"><ol class="toc"><li class="toc-item toc-level-1"><a class="toc-link" href="#Session%E5%85%B1%E4%BA%AB%E9%97%AE%E9%A2%98"><span class="toc-number">1.</span> <span class="toc-text">Session共享问题</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#Session%E5%85%B1%E4%BA%AB%E9%97%AE%E9%A2%98-1"><span class="toc-number">2.</span> <span class="toc-text">Session共享问题</span></a></li><li class="toc-item toc-level-1"><a class="toc-link" href="#Session%E5%85%B1%E4%BA%AB%E8%A7%A3%E5%86%B3"><span class="toc-number">3.</span> <span class="toc-text">Session共享解决</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#session%E5%A4%8D%E5%88%B6"><span class="toc-number">3.1.</span> <span class="toc-text">session复制</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%AE%A2%E6%88%B7%E7%AB%AF%E5%AD%98%E5%82%A8"><span class="toc-number">3.2.</span> <span class="toc-text">客户端存储</span></a><ol class="toc-child"><li class="toc-item toc-level-3"><a class="toc-link" href="#hash%E4%B8%80%E8%87%B4%E6%80%A7"><span class="toc-number">3.2.1.</span> <span class="toc-text">hash一致性</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E7%BB%9F%E4%B8%80%E5%AD%98%E5%82%A8"><span class="toc-number">3.2.2.</span> <span class="toc-text">统一存储</span></a></li><li class="toc-item toc-level-3"><a class="toc-link" href="#%E6%A0%B8%E5%BF%83%E5%8E%9F%E7%90%86"><span class="toc-number">3.2.3.</span> <span class="toc-text">核心原理</span></a></li></ol></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/posts/4995/" title="顺德好友小聚"><img src= "" 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